A recent United States Census Bureau report shows that there

[BTGmoderatorDC]

A recent United States Census Bureau report shows that there are more than three times as many households where the children and grandchildren are living in their grandparents' home as compared to households where the grandparents are living in their children's or grandchildren's home.

(A) as compared to households where the
(B) as there are households where the
(C) as those whose
(D) than compared to those where the
(E) than there are whose

OA B

Source: GMAT Prep

[ceilidh.erickson]

This question is testing COMPARISONS and IDIOMS.

The correct idiom is AS MANY ____ AS ____.
We can eliminate any answers that use "than": D and E. We can also eliminate the incorrect "as compared to" in A.

The larger comparison structure is "there are 3x as many households.... as...". We must compare "households" to "households." B clearly makes this comparison. In C, we could interpret "those" as referring to "households," but the "whose" would then be interpreted as "households whose grandparents...." Households can't possess grandparents, so this is illogical.

The correct answer is B.